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Sweetcorn Seeds - Early Extra Sweet F1

Botanical - Zea Mays


Seed Count:
15 Seeds
Usually despatched within 24 hours
See "Delivery Charge" tab below
Price £1.68

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15 Seeds.

Other Names - Corn on the Cob, Corn…

With its high sugar content Early Extra Sweet F1 produces a deliciously sweet juicy tasting cob. It is a reliable variety suited for British summers and produces a golden yellow cob averaging 20cm in length.

  • Produces golden yellow cobs with extra sweet and juicy kernels.
  • Performs well in British summers.
  • Award winner - RHS Award of Garden Merit.

Suitable For - Vegetable plot, raised beds, container garden, greenhouse

Sowing Months - Late April - May

Harvest - August - September

Gardening is about finding the right balance! Try growing Companion Plants close by to help deter pests.

  • Amaranth is great for attracting the ground beetle. This predatory beetle eats slugs, snails, slug and snail eggs, caterpillars and weed seed.
  • Spinach, lettuce, watercress, rocket and coriander make great companions for sweetcorn as these smaller plants will all benefit from being in the shade cast by the sweetcorn plants on hot summer days.
  • Low growing Limnanthes helps to keep the surrounding soil moist, supresses weed growth, attracts bees and hoverflies who's larvae feed on aphids. The plant can also be dug in as green manure at the end of the season.

Soil Preperation

For sweetcorn to thrive it must have fertile, moisture retentive soil with good drainage. Add a generous amount of well rotted manure or compost a few months before sowing or planting. Remove any weeds and add some general purpose organic fertilizer to the area 1 - 2 weeks before sowing or planting.

General InformationSowing & Planting Information
Habit Annual Module Grown & Transplants
Type Hybrid Distance between plants 35 cm
Position Full sun, sheltered Distance between rows 35 cm
Average height 180 cm Direct Sowing
Average spread 50 cm Sowing distance between plants 35 cm
Hardiness Half hardy Distance between rows 35 cm
Overwintering No Sowing depth 1 - 2 cm
Soil Ph 6.5 - 7.0 Germination temperature 16 to 25℃
    Days to germination 7 - 14 days

Sowing Guide

Early Sowing/Module Sowing

Root disturbance must be avoided when planting out as this will significantly affect the development of the plant. Sow 2 seeds per 5 - 7cm peat free pot (these biodegradable pots are ideal as the roots and pot can be planted into the ground with minimal disturbance to the roots)
Ensure enough heat is available for fast germination. As soon as germination starts reduce the heat a little and move to a well lit area, a warm windowsill or greenhouse is ideal.
A few days later remove the weakest seedlings, leaving one strong seedling in each pot. 3 - 5 weeks later (depending on the outdoor temperature) plant out into their final growing position. Harden off over 7 - 10 days before planting out to reduce shock.
For successful wind pollination to take place it is important to grow sweetcorn in rectangular blocks rather than single rows. Plant out at the distance suggested above. If the weather is cold cover with horticultural fleece until the weather warms up.

Direct Sowing

Avoid sowing outdoors too early especially if no protection will be given as the seedlings will struggle to thrive in cold weather and will be vulnerable to slug damage. An early direct sowing can be made under cloches. A large clear glass jar makes a good cloche. For successful wind pollination to take place the sweetcorn must be grown in rectangular blocks rather than a single row.
Sow 2 seeds per station at the depth and distance suggested above. Cover the seeds with soil and water well. Cover with a cloche. A few days after germination thin to one strong seedling per station. Remove the cloche when the plants outgrow the protective covering. After removing the cloche if the weather is cold especially at night cover with some horticultural fleece until the weather becomes warmer.

Growing On

Weed often to remove any competing plants. Roots will start to appear at the base of the stem. Cover these roots with some surrounding soil. Side shoots may start to grow, do not remove. Water well in dry weather especially at flowering time. If the growing area is exposed or tall varieties are grown sink a strong cane into the ground next to each stem and loosely tie the stem to the cane for additional support.
In June or July to help with pollination tap the tassels at the top of each stem and ensure a good amount of pollen falls onto the emerging hairs of each of the baby cobs.
Sweetcorn will benefit from a liquid feed when the cobs start to swell. The leaves of the comfrey plant when steeped in water for a few days produce a nutrient rich fertilizer.


One plant should produce 2 good sized cobs.
Test to see if the cobs are ripe when the silks (the tassels on the end of the cobs) have turned brown. To test, pull back part of the sheath (the green leafy covering) and squeeze 2 - 3 of the grains. If watery liquid squirts out the cob is under ripe and not ready for picking yet. If however the liquid is creamy it is ripe and ready for eating. If the liquid is thick and doughy unfortunately it is overripe and has passed its best.
To remove the cob from the stem carefully twist. A smaller cob will be ready a few weeks later. When all of the cobs have been picked off the plant cut the stem down to just under the soil level. Chop the stems into smaller pieces before composting otherwise they will take a long time to compost.


For good pollination to take place grow sweetcorn in blocks rather than rows.

Delivery Information

All products on this website are for delivery to the UK only.

(Including Northern Ireland, the Highlands & Islands, Scilly Isles, Channel Isles and the Isle of Man). Delivery charges to these areas are the same as UK mainland stated below (with no additional surcharge). Delivery however may take longer than the times stated due to weather, distance etc.)

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STANDARD DELIVERY - Royal Mail 2nd Class (3 - 5 working days) - £0.95

For orders under £9.98, the "Standard Delivery" charge will be added automatically at checkout.

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